Surprise guest coming for the holiday? Or maybe you're the surprise guest needing a last-minute hotel. Sure, you could call a hotel. But you can save time, maybe even a few bucks, and quickly find your options by using Hotel Tonight. Its launch last year has since prompted Priceline and Orbitz to enter the "tonight-only" deals fray with their own apps. Get it here: Hotel Tonight. For Android and iOS (free).